Snap this Atlas HO Deck Truss Bridge on top of Atlas' HO Bridge Piers and build a span of bridges of any length. Code 100. All bridges are the same length as a standard 9 inch Atlas straight track section. You can snap them together in any number and any arrangement to form your own design or to realistically replicate an existing bridge structure. Bridge dimensions: 9 inches x 1 3/8 inches x 2 1/4 inches.